Reinforcing-bar.



PATEN'IED JAN 22, 1907. G. E. VANDENBURGH.

REINFORGING BAR. Arruculon Hum KAY 9, 1906.

- INVENTOR 6 2 51% W1 i; B y

Alfomey :GEORGE E. VA'NDENBURT'GH, OF WASHINGTON, ms'r uo'r OF COLUMBIA.

REINFORCYING-BARF 1 lbw/ 1. whom 'it mwy concern:

Be itknown that'I, GEORGE E. VANDEN- BURGH, a citizen of the United States,- residing at Washington, District of Columbia,

have invented'certain. new and useful Improvements; 1n Reinforcing-Bars, of which the following-is a specification, reference be- T thereby.

'inghad' therein to the accompanying drawings:

-' -'This invention relates to a reinforcing-bar particularly adapted for cement and concrete construction wherein the bar. is .embedded in the plastic body to be supported The invention has for an object to provide a reinforcing-bar with one or more spirallydis 'osed coils securedto the bar so as to provi e an extended area ofcontaot adapted to t resist strain longitudinally and laterally. of

the bar and to form a truss within the body of concrete or other plastic material which pro- "I vides themaximum of supporting strength in the arch orsurface to be formed.

Other and further objectsand advantages of the inventionwill be hereinafter set forth,

and the novel features thereof-defined by the" [appended claims.

tical section on the line 2 2, Fig. -1.

a detail perspective of the primary and sec- In the drawings, Figure 1 is a vertical sections'howin'g the bar applied to supporting girders or beams. Fig. 2 is an enlarged ver- Fig. 3 is ondary coils shown'in Fig. 1. Fig. 4 is a similar view of-a modified form using one coil. Fig. 5 is a. detail plan of the form shown in Fig. 3, and Fig. 6 is an elevation of 'two meshing coils used for girder and column construction. v

Like numerals of reference indicate like parts-in the several figures of the drawings.

The numerall designates a'bar which may be of-any desired constructionor configuration and supported in any preferred man .ner. For instance, when used 1n arch construction it is'adapted to rest upon the base 'of the beams or girders 2 sufficiently above the lower surface thereofto provide for the fading of the concrete or cement beneath the lower face of the bar. The coils iaresecured Specification of Lotters'Patent.

a iimion ma lay 9,1906. Ecricel to. 315.959.

\ Patented an. 22. 1907.

coil 6, extending in one direction, as shown in 'Fig. 4, which is sufficient inv light construc- ,the coil 6 at a point directly above the bar,

thus providing a construction in which all lateral pull or strain of the coil is avoided, owing to the e ualization thereof by the oppositely-exten ing coils and the tendency of the coils to move or flatten toward the face of the barresisted. This preferred construction is shown in Figs. 1 and 3, and it is also desirable that bothof the coils be deflected away from the center of the bar, as shown in Fig. 1, as the greatest supporting strain carried by. the arch is at the center thereof, and this deflection therefore resists such strain and tends to draw the coils upward into a position at right angles to the bar.

As a preferred means of securing the coils to the bar I have shown a series of kerfs 8 in one face of the bar inclined away from the center of the bar toward the opposite ends thereof, and the coils are seated within these .kerfs and held therein by means of the integral spurs 9, which are forced downward the minimum'of weight in. the reinforcing material.

In the operation of the invention it will be seen that the bar supporting the coil resists any movement thereof longitudinally of the bar and provides the necessary strength upon which the truss'structure formed by the coils is carried. These coils being extendedin opposite directions and embedded in the material provide the maximum strength to resist either lateral or longitudinal pressure with the minimum weight and quantity of material, as owing to their opposite direction of curvature they effectually oppose the strain placed thereon, while their deflection toward the oppositeends of the bar resists the central downward strain of the arch. i v

It will be seen that this form of bar is very simple and economical .in construction,

IIO

' set forth its merits, what I claim, and desire while embodying the greatest efliciency in use. This bar, although described in-connection arch and column construction, is. adapted for use in any character of metal, reinforced concrete, or cement construction. 7

Having nowdescribed my inventionand to secure by Letters Patent, is

1. In a reinforcingebar, a spiral coil rigidly secured thereto at two points in each convolution thereof and extended beyond and'free of said bar at the opposite side therefrom to the securing-point. 7 V v 2. In a reinforcing-bar, a spiral coil rigidly secured thereto at two points in each convolution thereof and extended beyond and free of said bar at the opposite side therefrom to the securing-point, said coils being deflected in opposite directionsf-romthe center of the bar toward the ends thereof.

3. A reinforcing-bar provided upon one end with a series of-kerfs each having an integral .overlapping spur, and a coil disposed in said kerfs, each convolution thereof being retained beneath one of said spurs.

4. A reinforcing-bar provided upon one edge with a .series of kerfs disposed diagonally tothe length of the bar each having an overlapping integral spur projected toward the center of the bar, and a coil disposed in said kerfs and-retained beneath said spurs.

5. A reinforcin -bar provided with a spirally-disposed coi secured thereto and ex.- tendedfree of said bar, and a secondary spirally-disposed coiled strand secured to the bar and extending-in the opposite direction to the first-mentioned coil.

. 6. A reinforcing-bar provided at opposite thereto and deflected in opposite directions sides of its center-with spiral coils secured spiral coil secured to the bar and extended in the opposite direction to the first-mentioned coil throughout the length thereof.

In testimony whereof I aflix my signature in presence of two witnesses.

GEORGE E. .VANDENBURGH. -Witnesses:

ALFRED T. GAGE, JOHN L. FLETCHER. 

